Gemstone



FIG. 1 is a top plan view of a gemstone showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a is a side elevation view thereof, the other side being a mirror image thereof;

FIG. 4 is a is a bottom plan view thereof;

FIG. 5 is a is a top perspective view thereof; and,

FIG. 6 is a bottom perspective view thereof. 

The ornamental design for a gemstone, as shown and described. 